Module prometheus_mnesia

Description
Function Index
Function Details

Mnesia instrumentation helpers.

Function Index

table_disk_size/1	Equivalent to `table_disk_size(mnesia:system_info(directory), Table)`.
table_disk_size/2	Returns sum of all mnesia files for the given `Table` in bytes.
tm_info/0	Returns {PCount, CCount} tuple, where PCount is a number of participant transactions and CCount is a number of coordinator transactions.

Function Details

table_disk_size/1

table_disk_size(Table) -> Size

Table = file:name_all()
Size = non_neg_integer()

Equivalent to table_disk_size(mnesia:system_info(directory), Table).

table_disk_size/2

table_disk_size(Dir, Table) -> Size

Dir = file:name_all()
Table = file:name_all()
Size = non_neg_integer()

Returns sum of all mnesia files for the given Table in bytes. Mnesia can create different files for each table: - .DAT - DETS files - .TMP - temp files - .DMP - dumped ets tables - .DCD - disc copies data - .DCL - disc copies log - .LOGTMP - disc copies log

More on Mnesia files can be found in Mnesia System Information chapter of Mnesia User's Guide

tm_info/0

tm_info() -> {Ps, Cs} | {undefined, undefined}

Ps = non_neg_integer()
Cs = non_neg_integer()

Returns {PCount, CCount} tuple, where PCount is a number of participant transactions and CCount is a number of coordinator transactions. Can return {undefined, undefined} occasionally.